Step-up ring question

I am in the market for a new filter and was considering buying 77mm filter even though the lens I'm currently using is 72mm. I'm planning on eventually picking up a wide angle lens and most of those are 77mm, so I figured I'd be prepared.

In the meantime, I would be using a step up filter to use the 77mm filter on my 72mm lens. It would be a pain to have to put that on every time. I've never used a step up ring before, can I just attach it directly to the filter and leave it there as if it were all one piece, or would it not be secure enough on there?

It is much more important to have a lens hood fitted, than a filter... how are you going to fit a normal hood over an oversize filter and ring combination?

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Regards,Baz"Ahh... But the thing is, these guys were no ORDINARY time travellers!"